*Combine 1/2 of the Italian dressing, Onion, tomato, chilies and chili powder in a microwave proof bowl or casserole.
*Microwave at full power, uncovered, for 4 minutes or until vegetables are tender and mixture is thickened, stir in cilantro.
* Sprinkle 1/2 cup Cheese on 1/2 of each tortilla and top with 3 tablespoons vegetable mixture.
*Fold tortillas in half and brush with remaining Italian dressing.
* Place 3 filled tortillas on a wax paper lined plate and microwave on High for 1 minute or until Cheese is melted;
* Same with remaining tortillas.
*Cut each quesadilla into thirds.
*Garnish with salsa, guacamole and sour cream if desired;
*Serve immediately.